Edmonton Claim Group
The Edmonton claim group is composed of 95 contiguous quartz claims covering an area of 19.9 square kilometres near the community of Mayo, Yukon, Canada on NTS map sheets 105M15 and 105M10. Access is primarily by helicopter. The claim group is also accessible from Mayo Lake, which has a boat launch located at its west end.
Edmonton is a rectangular-shaped property on the north side of the Fork Plateau between the Nelson and Edwards arms of Mayo Lake. Creeks drain north towards Mayo Lake. The claim group is bordered to the west by Edmonton Creek, a historically active placer creek. Other creeks that drain to the east are shown to have been placer mined in the past. Tributaries to Mayo Lake are narrow and confined by moderate to steep slopes. The plateau is gently sloping with local prominences corresponding to gabbro stocks.
The claim group has been subjected to multiple glaciations. The McConnell Glaciation, which is the youngest Pleistocene Glaciation, was confined to the valley occupied by Mayo Lake. This valley was filled with westward fast-flowing ice that scoured its bottoms and sides. The upper limit of the McConnell Glaciation is marked by lateral moraines and kame terraces. The highest part of uplands were covered by glacial ice during an older glaciation, the Reid Glaciation. Due to the elevation of this part of the upland, the ice was probably cold-based and transport of rock and debris was minimal as is evidenced by landforms. The surface cover is mapped as a mixture of colluvium and till. Patches of buried colluvium and alluvial benches may be representative of the Reid and older Pleistocene glaciations.
Edmonton is underlain by the Robert Service Thrust, which is a broad structure containing a complex intermingling of Keno Hill Quartzites and Hyland Group metasediments intruded by competent gabbroic rocks. The thrust limit is mapped as a surface trace on the Edmonton claim group, when it is more likely a series of multiple sub-horizontal faults.
Work by MLM delineated a large geophysical anomaly in the southern part of the claim group with one boundary that is marked by elevated gold in soil values (Figure 11). This anomaly is interpreted to be a buried stock or alteration zone of unknown provenance. The true extent and nature of gold in rock source has yet to be determined.
Figure 11: Gold anomaly at edge of large geophysical anomaly on the Edmonton property.